When I was in spa, I had a car hired and stayed in Leige. It took about an hour to get back on both evenings, There are low budget hotels Like the ETAP for €40 or there are 2 Formule 1 hotels for about €30 a night, thies are basic, clean, sleep over hotels, they have continental breakfast which you wont need as he will be gone in the morn early,There are some nice friendly pubs and restaurants around town where we got fed well. The campers around Spa seemed to have better night fun. The noise and eau rouge bend standing on its end is what took me.